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EARNINGS (LOSS) PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Earnings Per Share [Abstract]      
Net income attributable to Quest Diagnostics $ 946 $ 1,995 $ 1,431
Less: Earnings allocated to participating securities 4 7 6
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted $ 942 $ 1,988 $ 1,425
Weighted average common shares outstanding - basic 116 125 134
Stock options and performance share units 2 3 2
Weighted average common shares outstanding - diluted 118 128 136
Basic (in dollars per share) $ 8.10 $ 15.85 $ 10.62
Diluted (in dollars per share) $ 7.97 $ 15.55 $ 10.47
Stock options and performance share units not included due to their antidilutive effect 0 0 1
Accelerated Share Repurchase Agreements      
Accelerated Share Repurchases [Line Items]      
Accelerated share repurchases, payment   $ 1,500